CN102977558A - Plastic composition - Google Patents

Abstract

The plastic composition comprises polyethylene terephthalate and nylon, wherein the weight percentage of the polyethylene terephthalate is between 20% and 90%, and the weight percentage of the nylon is between 5% and 40%. The plastic composition can replace the existing PC/ABS engineering plastic composition, and further achieves a certain effect on environmental protection and waste reduction.

Description

plastic composition

technical field

The present invention relates to a plastic composition.

Background technique

Driven by the trend of energy saving and carbon reduction, more and more companies have invested in the research and development of recycled plastics. Among them, the mixture of polycarbonate and acrylonitrile-butadiene-styrene copolymer (PC/ABS) is a plastic material synthesized from polycarbonate (Polycarbonate) and acrylonitrile-butadiene-styrene copolymer (ABS). Plastic, which combines the excellent characteristics of both materials, is widely used in automotive interior parts, office equipment, communication equipment, home appliances, and lighting equipment.

Generally speaking, PC/ABS is a defective product produced during the manufacturing process of general plastic products, or after waste plastics are recycled from discarded optical discs, general engineering plastics are added at a ratio ranging from 10 to 80%. into recycled plastic compositions. However, for engineering plastics that emphasize rigidity, PC/ABS cannot achieve a high addition amount (>50%) in this way, that is, its recycling amount is small, and the results of environmental protection and waste reduction are not obvious. In addition, during the recycling process of waste plastics, bisphenol-A environmental hormones will be produced, which may remain on the final plastics, posing a certain threat to the human body.

Contents of the invention

The invention provides a plastic composition capable of increasing the amount of plastic recycling and achieving environmental protection.

The plastic composition provided by the present invention comprises polyethylene terephthalate and nylon, wherein the weight percentage of polyethylene terephthalate is between 20% and 90%, and the weight percentage of nylon is between Between 5% and 40%.

As mentioned above, the plastic composition of the present invention uses polyethylene terephthalate (PET) as the main raw material, and PET is a widely used commercial plastic composition, the most common being plastic bottles. Therefore, the present invention can recycle and crack the huge waste plastic bottles, and use PET as the main body (the content can exceed 50%), and add 5% to 40% nylon (which can come from waste nylon yarn) to increase the strength. The synthesized plastic composition can replace the existing PC/ABS engineering plastic composition, thereby achieving a certain effect on environmental protection and waste reduction.

Description of drawings

Fig. 1 is the flow diagram of a kind of manufacturing method of the plastic composition of preferred embodiment of the present invention; And

Fig. 2 is a schematic flow chart of another manufacturing method of the plastic composition of the preferred embodiment of the present invention.

Detailed ways

A plastic composition according to a preferred embodiment of the present invention will be described below with reference to related drawings, wherein the same elements will be described with the same reference symbols.

A kind of plastic composition of preferred embodiment of the present invention, its composition comprises polyethylene terephthalate (Polyethylene Terephthalate, PET) and nylon (Nylon), wherein, the weight percentage of polyethylene terephthalate is between The weight percentage of nylon is between 5% and 40% between 20% and 90%. Here, nylon is, for example, polycaprolactam (nylon-6). Both polyethylene terephthalate and nylon are crystalline materials.

In addition, in one embodiment, the components of the plastic composition may further include polyphenylene sulfide (PPS), which can improve the rigidity of the plastic composition. The weight percentage of polyphenylene sulfide is, for example but not limited to, greater than zero and less than 20%.

In addition, the components of the plastic composition of this embodiment may also include a modifier, and the modifier may, for example, include at least one of them. The weight percentage of the modifying agent may be, for example but not limited to, less than 30%.

In addition, the plastic composition of this embodiment may further include glass fibers, and the weight percentage of the glass fibers is, for example but not limited to, less than 20%. In addition, the plastic composition of this embodiment may further include mineral fibers or carbon fibers. Mineral fibers are natural or synthetic inorganic powders such as mica powder and talcum powder, but are not limited thereto.

The plastic composition of this embodiment can be manufactured in various ways, which are illustrated below with reference to FIG. 1 and FIG. 2 .

The first method is shown in Figure 1:

Waste plastic bottles are recovered and processed into bottle flakes, which are washed and sent to the reactor for rectification. Put in an appropriate catalyst to depolymerize the reacted bottle flakes into ethylene terephthalate with increased molecular weight, and cool it into powder, then send it to an extrusion molding machine for melting, and then extrude and granulate and then cut. Make it colloid I (mainly PET components).

Next, wash and dry the waste nylon filaments, re-extrude and inject them into granules, use twin-screw injection machine equipment, and then mix polyphenylene sulfide (PPS) particles in different positions, and add solubilizers and flame retardants After injection and granulation, it is sheared to form colloid II, which is a mixture containing nylon and polyphenylene sulfide.

Colloid I and Colloid II are fully mixed through a V-type mixer, and additives and lubricants are mixed in during the middle process. After washing, they are put into the reactor for rectification again. During the process, catalysts and curing agents are added to improve Viscosity action, cooling into powder after discharge. Put the powder into the single-screw injection machine again, add adhesive, glass fiber and flame retardant during the process, and do the final extrusion and granulation. After shearing, it is cooled and formed into the final plastic composition.

The second method is shown in Figure 2:

Waste plastic bottles are recovered and turned into bottle flakes. The bottle flakes are washed and sent to the reactor for rectification. After completion, they are sent to the reactor for depolymerization process. Modifiers and appropriate catalysts need to be added to make the reaction The final bottle flakes are depolymerized into ethylene terephthalate with increased molecular weight, then cooled into powder, sent to an extrusion molding machine for melting, extruded and granulated, and then cut to make rubber particles I (mainly PET Element).

Clean and dry the waste nylon filaments, re-extrude and inject them, and re-granulate them. After adding modifiers (including flame retardants), do the first injection granulation. After completion, add modifiers to make the particles After the second injection granulation, it is sheared and becomes colloid II (Nylon).

Colloid I and Colloid II are fully mixed through a V-type mixer. In the middle process, slip agent is mixed in, washed and then put into the reactor for rectification. During the process, the catalyst and curing agent are added to increase the viscosity. action, and then cool into powder after discharge. Put the powder into the single-screw injection machine, and then add the adhesive and glass fiber in the process, and do the first extrusion granulation. After cutting, it is cooled and shaped, and then mineral fiber or carbon fiber particles are added as appropriate, and then extruded and granulated for the second time to become the final plastic composition.

To sum up, the plastic composition of the present invention uses polyethylene terephthalate (PET) as the main raw material, and PET is a widely used commercial plastic composition, the most common being plastic bottles. Therefore, the present invention can recycle and crack the huge waste plastic bottles, and use PET as the main body (the content can exceed 50%), and add 5% to 40% nylon (which can come from waste nylon yarn) to increase the strength. The synthesized plastic composition can replace the existing PC/ABS engineering plastic composition, thereby achieving a certain effect on environmental protection and waste reduction. In addition, the present invention can also add polyphenylene sulfide (PPS) to improve the rigidity of the plastic composition.

The traditional method usually directly recycles waste PET bottles, and then adds or depolymerizes them into chips (chips), and then uses a twin-screw injection machine to mix and inject polycarbonate (PC) and organic binders. Colloidal particles of the composite plastic composition are obtained. However, the practice of the present invention is to use nylon as the mixing object, because nylon has a relatively high toughness and can be used as the main source of toughness in the plastic composition.

Since the plastic composition of the present invention has considerable rigidity and toughness, it can meet the rigidity and toughness required by the appearance structural parts of 3C products (such as notebook computers, mobile phones, tablet computers, etc.), making the plastic composition of the present invention applicable. In the manufacture of 3C products. In addition, the present invention can increase rigidity again by adding mineral fiber or carbon fiber.

In the past, for engineering plastic compositions used in 3C products, the above requirements could not be met under the consideration of the flame retardant requirements of halogen-free content. Therefore, traditional recycled plastic compositions have not been used in the above-mentioned applications. The product.

The above descriptions are illustrative only, not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the scope defined in the claims.

Claims (10)

1. a plastics composite is characterized in that, its composition comprises polyethylene terephthalate and nylon, and wherein, the weight percent of polyethylene terephthalate is between 20% and 90%, and the weight percent of nylon is between 5% and 40%.

2. plastics composite according to claim 1 is characterized in that, wherein above-mentioned nylon is polycaprolactam.

3. plastics composite according to claim 1 is characterized in that, its composition also comprises polyphenylene sulfide.

4. plastics composite according to claim 3 is characterized in that, wherein the weight percent of above-mentioned polyphenylene sulfide is less than 20%.

5. plastics composite according to claim 1 is characterized in that, its composition also comprises modification agent.

6. plastics composite according to claim 5 is characterized in that, wherein the weight percent of above-mentioned modification agent is less than 30%.

7. plastics composite according to claim 5 is characterized in that, wherein above-mentioned modification agent comprises at least one of them or its combination of solubilizing agent, lubrication prescription, flow agent, halogen-free flame retardants, toughner, solidifying agent, catalyzer and cementing agent.

8. plastics composite according to claim 1 is characterized in that, its composition also comprises glass fibre.

9. plastics composite according to claim 8 is characterized in that, wherein the weight percent of above-mentioned glass fibre is less than 20%.

10. plastics composite according to claim 1 is characterized in that, wherein its composition also comprises ore deposit fiber or carbon fiber.

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